forked from mkabilov/pg2ch
/
stream.go
307 lines (258 loc) · 6.86 KB
/
stream.go
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package replicator
import (
"fmt"
"sort"
"time"
"github.com/mkabilov/pg2ch/pkg/config"
"github.com/mkabilov/pg2ch/pkg/message"
"github.com/mkabilov/pg2ch/pkg/utils/dbtypes"
)
func (r *Replicator) tblBuffersFlush() error { // protected by inTxMutex: inactivity merge or on commit
for tblName := range r.tablesToFlush {
r.logger.Debugf("buffer flush: processing %s table", tblName)
select {
case <-r.ctx.Done():
return nil
default:
}
if err := r.chTables[tblName].Flush(); err != nil {
return fmt.Errorf("could not commit %s table: %v", tblName.String(), err)
}
delete(r.tablesToFlush, tblName)
}
r.consumer.AdvanceLSN(r.txFinalLSN) //TODO: wrong?
return nil
}
func (r *Replicator) checkAndGetTable(oid dbtypes.OID) (chTbl clickHouseTable, err error) {
var tblLSN dbtypes.LSN
tblName, ok := r.oidName[oid]
if !ok {
return
}
chTbl, ok = r.chTables[tblName]
if !ok {
return
}
if _, ok := r.tablesToFlush[tblName]; !ok {
r.tablesToFlush[tblName] = struct{}{}
}
if tblKey := tblName.KeyName(); r.persStorage.Has(tblKey) {
var err error
tblLSN, err = r.persStorage.ReadLSN(tblKey)
if err != nil {
r.logger.Warnf("incorrect lsn stored for %q table: %v", tblName, err)
}
}
if r.txFinalLSN <= tblLSN {
r.logger.Debugf("tx lsn(%v) <= table lsn(%v)", r.txFinalLSN.Dec(), tblLSN.Dec())
chTbl = nil
}
if _, ok := r.inTxTables[tblName]; !ok && chTbl != nil { // TODO: skip adding tables with no buffer table
r.inTxTables[tblName] = chTbl
r.logger.Debugf("table %s was added to inTxTables", tblName)
err = chTbl.Begin(r.txFinalLSN)
if err != nil {
err = fmt.Errorf("could not begin tx for table %q: %v", tblName, err)
}
}
return
}
// Print all replicated tables LSN
func (r *Replicator) PrintTablesLSN() {
var (
tables []string
maxLen int
lsnMap = make(map[string]string)
)
for tblName := range r.chTables {
var lsn string
name := tblName.String()
if len(name) > maxLen {
maxLen = len(name)
}
if tblKey := tblName.KeyName(); r.persStorage.Has(tblKey) {
tblLSN, err := r.persStorage.ReadLSN(tblKey)
if err != nil {
lsn = "INCORRECT"
} else {
lsn = tblLSN.String()
}
} else {
lsn = "NO"
}
lsnMap[name] = lsn
tables = append(tables, name)
}
sort.Strings(tables)
// print ordered list of tables
format := fmt.Sprintf("%%%ds\t%%s\n", maxLen)
for i := range tables {
fmt.Printf(format, tables[i], lsnMap[tables[i]])
}
}
func (r *Replicator) inactivityTblBufferFlush() {
defer r.wg.Done()
flushFn := func() {
if r.curState.Load() != StateWorking {
return
}
r.inTxMutex.Lock()
defer r.inTxMutex.Unlock()
r.logger.Debugf("inactivity tbl flush started")
defer r.logger.Debugf("inactivity tbl flush finished")
if err := r.tblBuffersFlush(); err != nil {
select {
case r.errCh <- fmt.Errorf("could not backgound merge tables: %v", err):
default:
}
}
}
ticker := time.NewTicker(r.cfg.InactivityFlushTimeout)
for {
select {
case <-r.ctx.Done():
return
case <-ticker.C:
flushFn()
}
}
}
func (r *Replicator) processBegin(finalLSN dbtypes.LSN) error { // TODO: make me lazy: begin transaction on first DML operation
r.logger.Debugf("begin. trying to acquire lock")
r.inTxMutex.Lock()
r.logger.Debugf("begin. lock acquired")
r.txFinalLSN = finalLSN
r.curTxTblFlushIsNeeded = false
r.isEmptyTx = true
return nil
}
func (r *Replicator) processCommit() error {
r.logger.Debugf("commit")
defer r.inTxMutex.Unlock()
inTxTables := make([]string, 0, len(r.inTxTables))
for tblName := range r.inTxTables {
inTxTables = append(inTxTables, tblName.String())
}
r.logger.Debugw("commit",
"isEmptyTx", r.isEmptyTx,
"inTxTables", inTxTables,
"flushIsNeeded", r.curTxTblFlushIsNeeded)
if !r.isEmptyTx {
for _, chTbl := range r.inTxTables {
if err := chTbl.Commit(); err != nil {
return fmt.Errorf("could not commit: %v", err)
}
}
}
r.inTxTables = make(map[config.PgTableName]clickHouseTable)
r.consumer.AdvanceLSN(r.txFinalLSN) // TODO: wrong?
return nil
}
func (r *Replicator) processRelation(msg *message.Relation) error {
if chTbl, err := r.checkAndGetTable(msg.OID); err != nil {
return err
} else if chTbl == nil {
r.logger.Debug("relation message: discarding")
return nil
}
tblName := r.oidName[msg.OID]
if relMsg, ok := r.tblRelMsgs[tblName]; ok {
if !relMsg.Equal(msg) {
r.logger.Fatalf("table or structure of %s table has been changed", tblName)
}
}
return nil
}
func (r *Replicator) processInsert(msg *message.Insert) error {
chTbl, err := r.checkAndGetTable(msg.RelationOID)
if err != nil {
return err
} else if chTbl == nil {
r.logger.Debug("insert message: discarding")
return nil
}
if err := chTbl.Insert(msg.NewRow); err != nil {
return fmt.Errorf("could not insert: %v", err)
}
r.isEmptyTx = false
return nil
}
func (r *Replicator) processUpdate(msg *message.Update) error {
chTbl, err := r.checkAndGetTable(msg.RelationOID)
if err != nil {
return err
} else if chTbl == nil {
r.logger.Debug("update message: discarding")
return nil
}
if err := chTbl.Update(msg.OldRow, msg.NewRow); err != nil {
return fmt.Errorf("could not update: %v", err)
}
r.isEmptyTx = false
return nil
}
func (r *Replicator) processDelete(msg *message.Delete) error {
chTbl, err := r.checkAndGetTable(msg.RelationOID)
if err != nil {
return err
} else if chTbl == nil {
r.logger.Debug("delete message: discarding")
return nil
}
if err := chTbl.Delete(msg.OldRow); err != nil {
return fmt.Errorf("could not delete: %v", err)
}
r.isEmptyTx = false
return nil
}
func (r *Replicator) processTruncate(msg *message.Truncate) error {
for _, oid := range msg.RelationOIDs {
if chTbl, err := r.checkAndGetTable(oid); err != nil {
return err
} else if chTbl == nil {
r.logger.Debug("truncate message: table with oid %v discarding", oid)
continue
} else {
if err := chTbl.Truncate(); err != nil {
return err
}
}
}
r.isEmptyTx = false
return nil
}
// HandleMessage processes the incoming wal message
func (r *Replicator) HandleMessage(lsn dbtypes.LSN, msg message.Message) error {
r.logger.Debugf("replication message %[1]T: %[1]v", msg)
if r.txFinalLSN == dbtypes.InvalidLSN {
if _, ok := msg.(message.Begin); !ok {
return nil
}
}
switch v := msg.(type) {
case *message.Begin:
if r.curState.Load() == StateShuttingDown {
r.logger.Debugf("shutting down. discarding %T message", msg)
r.txFinalLSN = dbtypes.InvalidLSN
return nil
}
return r.processBegin(v.FinalLSN)
case *message.Commit:
return r.processCommit()
case *message.Relation:
return r.processRelation(v)
case *message.Insert:
return r.processInsert(v)
case *message.Update:
return r.processUpdate(v)
case *message.Delete:
return r.processDelete(v)
case *message.Type:
r.logger.Debugf("incoming type message: %v", *v)
return nil
case *message.Truncate:
return r.processTruncate(v)
default:
return nil
}
}